.content{
 height: 100vh;
  background: url(../../asset/image/diqiu.jpeg) no-repeat center;
  background-size: cover;
  position: relative;
  .Card-box{
    width: 300px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
  }
}